I was trying to implement ELK stack using docker to collect logs from the machines which are in different network, would say that my docker Engine is in a private Network A and my hosts are in another private Network B. I have installed beats on my nodes and was trying to verify the ELK server configured in docker container in Network A. But I was not succeeded in verifying the ELK from beats hosts.

What I did?
On Network A:

Used sebp/elk image to start a ELK container

Did port forwarding for port 5601, 9200, 5044

Verified if kibana is loading in web and it was success

Generated SSL cert in the ELK container with the public IP of the host where docker was
installed.

copied this SSL cert on to the beats host /etc/pki/tls/certs/

On Network B:

Installed beats in the machine (Not a container)

configured filebeat.yml with the public IP of the Docker host with the port (Say x.x.x.x:8001)
and added ssl cert path

Restarted logstash in Network A and filebeat in Network B and received the following error